How to start
The aim is to restore the red and blue discs. Click or tap on the coloured dot to
turn the disc beside it by
one-sixth of a circle - the left hand disc turns left, the right hand to the right. This is a modern puzzle
invented by Douglas A. Engel in 1983.
produces a random puzzle to solve
sets the puzzle to back to the start position
shows the next step to solving the puzzle
solves the puzzle, playing through the whole solution automatically; press it again to pause the solving.
On to the more colourful and intriguing version called the Turnstile Puzzle